We reported on the oral findings and the dental treatment for a patient with osteogenesis imperfecta type IVB between the ages of 11 and 17.
1. At the age of 11, the patient exhibited Skeletal Class III tendency malocclusion. The upper teeth and lower teeth were in contact only at the central incisors and right first molars.
2. All of the permanent teeth were translucent and brown. The teeth that had surfaces in contact were accompanied with exfoliation of the enamel following dentin exposure and wear.
3. Increased constrictions at the coronal-radicular junction and thinner roots were observed in all of the permanent teeth.
4. A resin splint was fitted on the lower dentition for the purpose of improving mastication and preventing attrition.
5. The patient has been using the resin splint successfully. We consider that the application of the resin splint is an effective treatment for patients with osteogenesis imperfecta.